[Shtoom] bug fix for non-20ms codecs

diff for shtoom/doug/leg.py
60,61c60
< if sample:
< self._voiceapp.va_outgoingRTP(sample, self._cookie)
---
> self._voiceapp.va_outgoingRTP(sample, self._cookie)
This probably should be there regardless, but in supporting 30ms
based iLBC I found this necessary to avoid chopping associated with
shtoom's 20ms timer.
aaron